My (non-provable) theory is that Satoshi is not a person but a team, now defunct, that was tasked with developing a crypto-currency. They are probably more scientists/mathematicians/economists than they are software developers, which would explain the very sound but not exactly elegant initial code. It would also explain the silence - the project is over, the team is probably bound to secrecy because this stuff is cl…
> The only time Satoshi spoke out was to help the poor bloke who was mistaken to be Satoshi no, the forum account was hacked to make that claim. It wasn't by Satoshi.
Are you sure, I wasn't aware of that?
Edit: the "I am not Dorian Nakamoto" was on March 7 2014, the account hack on Sept 8 of same year. It doesn't prove it conclusively. In fact the hack may well have been done deliberately, for a (kind of) plausible deniability (i.e. now you can't tell whether it was the real "Satoshi" and thus there was no provable breach of secrecy).